On a more serious note, you'll only get out of one of his seminars what you want. He is a very good speaker, and it's probably worth it just for that (assuming it is him speaking, and not staff). But his message is very much one of self-determination - "You can do anything, if only you take massive action today". And it's very likely true, if you are willing to take massive action on something starting right now, you can make vast changes. People get caught in a rut, or pattern, of living, and sometimes it isn't a good thing. He can provide a jolt for some people to help them get out of the rut.
Where people dislike him, or feel like he is a con-man, is that he is charging money (and in many times, an escalating amount) to tell you that only you can change your life. Well, duh! His programs feed on each other, to the point where people have found they have spent thousands of dollars to listen to him tell them how good their life can be, but never took any action and so now feel that they have wasted (or even been conned out of) that money.
Personally, I think his story and stage presence are pretty amazing, and if you've never seem him speak, it's probably a good time. But remember, he is in the business of getting people to purchase his courses, seminars and books.